Please read it through and give your honest opinion. This is going to be my first IPA and I want somebody who has made a batch tell me what they think.
Different hops maybe, more or less malts, a different type of malt.
Different type of yeast.

I'd maybe do 1 oz of Northern Brewer and 1 oz Chinook @ 60 and the other oz of Brewer @ 20 (or just use 1 oz of NB @ 20 -- 5 oz. will be a lot of hops in this beer -- which isn't a bad thing, just an observation).

The S 05 is fine yeast, but look into White Labs WL051. It's the only yeast I use in IPA's. Also, if you're a hop freak like many of us, you could dry hop with an ounce of Cascade or something similar. To be honest though, the recipe looks great as is. Just giving you my $.02.

I might have to try another batch with Simcoe. I did an amarillo-simcoe IPA with a tried and true grain bill. Was not my favorite by a long shot. Maybe its just me? I know this is a popular combination, so you may like it.